2,2′-Dimethoxy-1,1′-binaphthyl-3,3′-diborsäure, ein vielseitiges Zwischenprodukt in der Synthese 3,3′-diarylsubstituierter Binaphthylderivate

Kratky, Petra; Haslinger, Ulrike; Widhalm, Michael

doi:10.1007/s007060050155

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“…Thus, 4-bromodiphenyl ether ( 11 ) was quantitatively converted to 4-bromo-4‘-iododiphenyl ether ( 12 ) using iodine monochloride in refluxing acetic acid . By taking avantage of the fact that lithiation of compound 12 should occur selectively at the C−I bond, it was treated with 1 equiv of n -BuLi in Et 2 O in the presence of TMEDA at −78 °C, and the resulting mixture was quenched with trimethylborate. After hydrolysis, the free boronic acid was used without any purification in the next step, which consists of esterification with 2,2-dimethylpropan-1,3-diol.…”

Section: Resultsmentioning

confidence: 99%

Quantitative Formation of [2]Catenanes Using Copper(I) and Palladium(II) as Templating and Assembling Centers: The Entwining Route and the Threading Approach

et al. 2003

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Transition metal-mediated templating and self-assembly have shown powerful potentials for the synthesis of interlocked molecules. These two strategies were combined in designing and preparing a new type of coordination catenanes incorporating Cu(I) and Pd(II) metal centers. The ligand designed here contains a phenanthroline core and pyridine sidearms (compound 1). Using this phenanthroline-pyridine conjugated ligand, two approaches were examined, which were shown to be surprisingly efficient for the catenane synthesis: the entwining route (entwining of two ligands around Cu(I) followed by Pd(II) clipping) and the threading approach (Cu(I)-templated threading of a cyclic ligand on an acyclic ligand followed by the Pd(II) clipping of the second ring). In the former method, stepwise treatment of 1 with Cu(CH(3)CN)(4)PF(6) (templating center) and enPd(NO(3))(2) (assembling center) gives rise to the quantitative formation of CuPd(2) catenane 18. In the latter method, Cu(I) templates the threading of phenanthroline-containing macrocycle 2 on ligand 1, which is followed by Pd(II) clipping to give hetero catenane 20. In both approaches, the formation of catenanes is convincing thanks to the strong templating effect of Cu(I), while the ring closure steps are efficiently furnished by Pd(II)-directed self-assembly.

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Section: Resultsmentioning

confidence: 99%